Changes in / [84a6e70:b14ec5f]


Ignore:
Location:
libcfa/src/concurrency
Files:
3 edited

Legend:

Unmodified
Added
Removed
  • libcfa/src/concurrency/kernel.cfa

    r84a6e70 rb14ec5f  
    126126static bool mark_idle (__cluster_proc_list & idles, processor & proc);
    127127static void mark_awake(__cluster_proc_list & idles, processor & proc);
    128 static [unsigned idle, unsigned total, * processor] query_idles( & __cluster_proc_list idles );
    129128
    130129extern void __cfa_io_start( processor * );
     
    766765
    767766        // Check if there is a sleeping processor
    768         processor * p;
    769         unsigned idle;
    770         unsigned total;
    771         [idle, total, p] = query_idles(this->procs);
     767        int fd = __atomic_load_n(&this->procs.fd, __ATOMIC_SEQ_CST);
    772768
    773769        // If no one is sleeping, we are done
    774         if( idle == 0 ) return;
     770        if( fd == 0 ) return;
    775771
    776772        // We found a processor, wake it up
    777773        eventfd_t val;
    778774        val = 1;
    779         eventfd_write( p->idle, val );
     775        eventfd_write( fd, val );
    780776
    781777        #if !defined(__CFA_NO_STATISTICS__)
     
    813809                remove(proc);
    814810                insert_first(this.idles, proc);
     811
     812                __atomic_store_n(&this.fd, proc.idle, __ATOMIC_SEQ_CST);
    815813        unlock( this );
    816814        /* paranoid */ verify( ! __preemption_enabled() );
     
    826824                remove(proc);
    827825                insert_last(this.actives, proc);
     826
     827                __atomic_store_n(&this.fd, this.idles`first.idle, __ATOMIC_SEQ_CST);
    828828        unlock( this );
    829         /* paranoid */ verify( ! __preemption_enabled() );
    830 }
    831 
    832 static [unsigned idle, unsigned total, * processor] query_idles( & __cluster_proc_list this ) {
    833         /* paranoid */ verify( ! __preemption_enabled() );
    834         /* paranoid */ verify( ready_schedule_islocked() );
    835 
    836         for() {
    837                 uint64_t l = __atomic_load_n(&this.lock, __ATOMIC_SEQ_CST);
    838                 if( 1 == (l % 2) ) { Pause(); continue; }
    839                 unsigned idle    = this.idle;
    840                 unsigned total   = this.total;
    841                 processor * proc = &this.idles`first;
    842                 // Compiler fence is unnecessary, but gcc-8 and older incorrectly reorder code without it
    843                 asm volatile("": : :"memory");
    844                 if(l != __atomic_load_n(&this.lock, __ATOMIC_SEQ_CST)) { Pause(); continue; }
    845                 return [idle, total, proc];
    846         }
    847 
    848         /* paranoid */ verify( ready_schedule_islocked() );
    849829        /* paranoid */ verify( ! __preemption_enabled() );
    850830}
     
    908888                if(head == tail) return false;
    909889                #if OLD_MAIN
    910                 ready_schedule_lock();
    911                 ret = __cfa_io_drain( proc );
    912                 ready_schedule_unlock();
     890                        ready_schedule_lock();
     891                        ret = __cfa_io_drain( proc );
     892                        ready_schedule_unlock();
    913893                #else
    914894                        ret = __cfa_io_drain( proc );
    915         #endif
     895                #endif
    916896        #endif
    917897        return ret;
  • libcfa/src/concurrency/kernel.hfa

    r84a6e70 rb14ec5f  
    195195struct __cluster_proc_list {
    196196        // Spin lock protecting the queue
    197         volatile uint64_t lock;
     197        __spinlock_t lock;
     198
     199        // FD to use to wake a processor
     200        volatile int fd;
    198201
    199202        // Total number of processors
  • libcfa/src/concurrency/kernel/startup.cfa

    r84a6e70 rb14ec5f  
    584584// Cluster
    585585static void ?{}(__cluster_proc_list & this) {
    586         this.lock  = 0;
     586        this.fd    = 0;
    587587        this.idle  = 0;
    588588        this.total = 0;
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